{"id":"db08ceff-2171-4a3c-8b26-50880f647cd7","shortId":"YUr9Wf","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/cards/60` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. The endpoint accepts HTTP POST requests and returns application/json responses.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/cards/60` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepting payment negotiations, but the actual functionality behind this particular path is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","USDC API access","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for request or response payloads","The specific functionality of /api/v1/cards/60 ('Premium API Access') is completely undocumented","No request or response examples available anywhere in crawled materials","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/60","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/cards/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/cards/60 actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34,153 '0.02':16,33,75,152 '000':79 '20':78 '6':85 'Base network API' 'USDC API access' 'accept':157,215 'access':45,72 'actual':220 'advertis':108 'ai':10,27,120 'analysi':124 'analyt':114 'api':4,21,41,71,96,171 'application/json':163 'avail':229 'base':7,24,61,80 'behind':51,222 'broader':106 'call':77 'categori':110 'challeng':208 'classif':127 'confirm':209 'connect':180 'convers':144 'cost':74 'data':9,26,113,117 'decim':86 'descript':198 'detail':187 'doc':170 'document':165 'embed':128 'endpoint':14,31,50,65,112,148,156,203,211 'estim':138 'exact':93 'exampl':195 'exchang':133 'export':118 'extrem':167 'feed':132 'financ':11,28,129 'four':109 'function':221 'gas':137 'gate':3,20,44 'generat':145 'geocod':142 'handl':89 'http':158 'http-post' 'infrastructur':140 'insight':119 'json-response' 'key':97 'learn':122 'limit':100 'list':68,147 'live':213 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'marketplac':42 'materi':230 'metric':115 'micropay':55 'negoti':217 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':191 'page':175 'particular':224 'path':225 'pay-per-request API' 'payment':87,216 'per':53,76 'per-request':52 'per-request-micropayment' 'platform':5,22,107 'post':159 'premium':70 'price':131,154,172 'prompt':182 'protocol':40 'quot':136 'rate':99,134 'readm':174 'render':177 'report':116 'request':54,160 'request/response':194 'requir':104 'respons':164 'return':162,205 'schema':192 'scheme':94 'sentiment':123 'settl':56 'share':149 'spars':168 'specif':64,204 'subscript':103 'summar':126 'technic':186 'text':125 'token':135 'unclear':227 'unit':81 'usdc':58,83 'usdc-base' 'util':13,30,141 'valid':143 'varieti':48 'via':90 'wallet':181 'web3':130 'x402':2,19,39,92,207 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"6c87bddb-b9ea-4475-8fbb-38ab6465946f","listingId":"db08ceff-2171-4a3c-8b26-50880f647cd7","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/cards/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:52.122Z"}],"sources":[{"listingId":"db08ceff-2171-4a3c-8b26-50880f647cd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:52.122Z","lastSeenAt":"2026-04-23T02:31:11.531Z"}],"details":{"listingId":"db08ceff-2171-4a3c-8b26-50880f647cd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/60 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/60"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/60"}],"useCases":["Programmatic access to paid API endpoints without managing API keys or subscriptions","Agent-driven workflows that need on-demand data or AI inference with crypto micropayments","Exploring x402 protocol integration for pay-per-call service consumption"],"bestFor":["Developers experimenting with x402 micropayment-gated APIs","AI agents that can settle USDC payments on Base for per-call access","Users who want zero-commitment, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods","High-volume use cases where per-request pricing may not be cost-effective compared to subscription APIs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.082Z"},"updatedAt":"2026-04-23T02:31:11.531Z"}}